Description: Syncthing is a continuous file synchronization program. In Syncthing before version 1.15.0, the relay server `strelaysrv` can be caused to crash and exit by sending a relay message with a negative length field. Similarly, Syncthing itself can crash for the same reason if given a malformed message from a malicious relay server when attempting to join the relay. Relay joins are essentially random (from a subset of low latency relays) and Syncthing will by default restart when crashing, at which point it’s likely to pick another non-malicious relay. This flaw is fixed in version 1.15.0.
CVE-2021-21404
Published Date: 2021-04-06T20:15Z
Last Modified: 2021-04-14T18:00Z
CVSS Score: 7.5 (HIGH)
EPSS Score: 0.24%
Risk Score: 5.25 (HIGH)
Risk Score based on CVSS score and EPSS. This score is for reference purposes and is not internationally recognized.
CVSS:
7.5 |
EPSS:
0.24%
Mitre ATT&CK Technical v15.1
T1583.004 – Server
T1584.004 – Server
T1053.002 – At
Technical Analysis & Mitigation Measures
Reference Links
Vendor - Produce - Version
syncthing - syncthing
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